Disclosed is a control method of a laundry treatment apparatus including a cabinet defining an external appearance and having a front opening, a drawer provided to be discharged through the opening, a tub accommodated in the drawer to accommodate wash water therein, a drum rotatably provided inside the tub to accommodate laundry therein, a fastening unit configured to separably couple the drawer to the cabinet, and a sensing unit configured to sense whether the drawer is discharged from the cabinet, the method including receiving a control command to operate the laundry treatment apparatus, sensing whether insertion of the drawer into the cabinet is completed by controlling the sensing unit, locking the drawer to the cabinet by controlling the fastening unit, performing the control command, and releasing a locked state so as to separate the drawer from the cabinet by controlling the fastening unit when the control command is completely performed.